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EN
The lateral distribution of the effective contact potential difference (ECPD), often referred to as the work-function difference φMS, was determined experimentally for the first time over the gate area of a metal-oxide-semiconductor (MOS) structure. The photoelectric method for measuring φMS in MOS devices was modified to characterize the lateral distribution of ECPD. In square MOS gates, it is found that φMS values were highest in the center area of the gate, lower along the gate edges, and lowest at the gate corners. These results were confirmed by several independent photoelectric and electrical measurement methods. A model is proposed, in which the experimentally determined φ(x,y) distributions, are attributed to mechanical stress distribtitions in MOS structures. Equations are derived allowing calculation of φMS(x,y) distributions for various structures. Results of these calculations remain in agreement with experimentally obtained distributions.
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